[GRASS-user] problem with v.edit tool=merge

[Jarek Jasiewicz]

Martin Landa napisał(a):
> Hi Jarek,
>
> 2007/3/28, Jarek Jasiewicz <jarekj at amu.edu.pl>:
>
>> - it sometimes work, but new line has two categories on one layer, it is
>> corrected? IMHO it is not the best solution
>
> sometimes?;-)
I made several test on that file some lines have merged, but I can't say 
why that ones
>
> yes, it is not the best solution, but I am not sure what the user
> would expect, what do you thing? Merging two lines (layer 1) described
> bellow:
>
> +-----1/1-----+------1/2-----+
>
> we get new line
>
> +------1/?------+
>
> I think that the vector layer should not be changed (i.e. still layer 1).
>
> Currently this line gets category 1 and 2.

I think that tool is suitable to work on fresh vector (for example after 
r.to.vect) without atributies it will rather be a part of the sript than 
stand-alone tool,
maybe other grass-user will help which solution will be the best
>
>> - I did not reproduced merge in file i send. It has only worked when i
>> used cat=1-99999 (i.e only 2 or three lines has been merged)
>> - but if i used cat 1-99 it hasen't worked, no line has been merged
>
> I am not sure if I understand well, using your testing data
> cat=1-99999 and cat=1-99 works OK.
no, in that situation cat=1-99 gave negative result (no lines merged) 
but cat=1-99999 merged two or three lines
>
>> - there is no problem with merging if there are only two lines in map
if I prepared few vector with only two lines the result was OK
>> - if two lines has been merged and line with cat=1/2 has been created,

in some situations in file where were more than two lines with huge 
threshold first two lines, but no more lines can be merged again

Jarek